Hawke, 37, went on trial twice for the offence, having successfully appealed against the first conviction.

Ryan Hawke has been jailed for at least 17 years over the murder of Mark Koller in 2014. Picture: 9NEWS (Nine)

Hawke was yesterday sentenced to life in jail, bowing his head when he heard the minimum term.

The West Australian Supreme Court heard a drug-addled Hawke was enraged after he found out his girlfriend had taken part in a threesome with Mr Koller and his partner, and stabbed the victim six times with a knife during a confrontation outside Mr Koller's caravan.

"He was very annoyed someone had done this with his woman," prosecutor Sean O'Sullivan said during his opening address in November.

Hawke had argued self-defence, with his lawyer Justine Fisher saying some witnesses described Mr Koller as the aggressor.

The murder was carried out at the Crystal Brook Caravan Park in Perth. Picture: 9NEWS (Nine)Police scouring the scene after the victim's body was found. Picture: 9NEWS (Nine)